Any suggestions for a good option for something mattress-y to put under your sleeping bag while car camping?
It doesn't have to be sturdy enough to stand up to full-time use. (If/when it comes to that, I can rethink.)
I have an SUV with the back seats removed, and I could probably sleep in it as is, but it would be nice to even out the surface and cover up the metal bits that stick up out of the floor.
Cheap would be good (since I just spent a king's ransom on custom window shades), but not so cheap that it's impractical (since ditto). Compact would also be good.
Futon? yoga mat? those folding waffle-type things I've seen at Walmart? cardboard?
Any pitfalls to look out for on the lower-priced stuff in a generic camping section?
All clues welcome!
Thanks.